Activating decolorizing char for use in refining sugar and analogous purposes



" meted Dec. '15, 1925.

' .A ctivatin TES FICE.

CHARLES n. DAVIS, or NEW YOR N. Y.

ac' nva'rnre maconomzrno c'nan son nsn IN msrm'me runrosns.

lo Dre wing.

To allwhom it may concern:

of the borough of Manhattan, city, county,

and State of New York,have invented certain new and useful Improvements in Decolorizing Char for Use in Refining ugar and for Analogous Purposes, of which the following is a specification 'sufiicient to enable those skilled in the art to which the invention appertains to utilize the same. J The object of my invention is to effect the activating and hardening -of decolorizing char in a simple, effective, and comparatively inexpensive manner; and 1t COIXSlStS primarily and essentially in the use, for the. urpose, of a "distillate obtained from ituminous matter, substantially as hereinafter set forth, and claimed specifically. As is well known in the prior state of the art, new animal'bone char usedin the refin-i ing of raw cane' sugar, possesses very little decolorizin power, but by constant use it adsorbs an absorbs certain impurities from the sugar liquors which iinproveit in this- "have found by research investigation that the impurities which cause this increase in decolorizing power are pyrogenous sub stances from wax, albumen and oily matters present in the raw sugar product. These waxy, albumino'us and oily matters, in the -p'resenee-of water, heat and upinto synthetic bituminous ydrocarbon), matters which, odcarbonization and in presence of a carbonized bone structure such as the animal product, deposit a special carbon possessing intense decolorizi'ngand hardening power, as well as a capacityffor removing gums, albuminous matters, and

mineral constituents, 'or ash. This process however of building up this special carbon derived from the raws'ugar impurities is so slow and costly thatby the time it is'vnoticeable at, all the char has glazed over, becoming clogged so that it must be discarded from use as a char for further sugar refining,

I have also found that the synthetic pyrobituminous matters above referred to are contained in the distillate from coal, coming over between 315 C. and 450 0. Also that distillates other than this will clog the finished char with soot and coke, and render of about 600 C. to 900 C., then cooled out izer by its use in refining raw. sugar, that impurities, that it is reactivated or regenerressure split thetic bone char.

- Application filed October. 10, 1923. I Serial No. 667,629.

SUGAR AND ananocons it unfit for use, Therefore such distillates as benzol, pyr1d1ne,etc., and also those above 450 C and near the coking stage are detrimental for this purpose.

This product from coal distilled over be tween 315 C. and 450 CI is of waxy consistency, and yellow to brown in color. It leaves no coke on volatilization out of contact with air.

In carilying out my process of activating chars use in decolorizing the char is mixed with approximately 5% of its weight of the coal distillate and passed through a kiln out'of contact with airat bright red heat of contact with air, washed with hot water, dried and rekilned, when it is ready 'for use. I have found that after the char thus treatedhas become exhausted as a decolorless than of 1% of the activator has been rendered inactive, and that if this amount is again added before the char is rekilned out of contact with air to eliminate absorbed ated to a degree more than equal to the new product, its quality increasing with age and use; andalso that this process of reactivation can bev continued indefinitely, the char being hardened in structure at the same time.

n In adding this waxy coal distillate to'the. char before kilning it may be sprayed on or mixed with powdered char and the resulting compound mingled with the main body or mass of char, and then this assed through the kiln out of contact with air. Or "the waxy coal distillatemay be converted into a watery emulsion with lime water, molasses residues, .or other colloidal substances, and

char before kilning. a It is to be understood that I donot re-' strict myself to animal bone char, since this watery emulsion introduced into the synthetic bone char, discard char, char made .from refinery press-cake mud containing calcium phosphate and decolorizing char in general, may be so treated with substantially y like results. i s a I The finished char thus attained is free from carbonates uncombined with my special carbon.

I have found that my method is espe- I cially eflicacious in the treatment of syn:

I have also found that itis only to addmore or less of the active principle obtained b the distillation herein set forth to obtain t e desired results;.

'What I'claim as'my invention and wish to secure by Letters Patent is 1..Ihe process of activating bone char hereiniset forth, consisting essentially in adding thereto a carbon-forming distillate of coal, which is non-volatile at ordinary temperatures, passing the/same throu h a kiln out of contact with air at ared under 1000 (3., cooling the resultant out of contact with air, washing the same with hot water, and'then drying and kilning-out of contact with air (prior to use, substantially in the manner an for the purpose set/forth,

2. The process of activating bone char herein set .forth, consisting essentially in adding thereto a distillate of coal obtained at a temperature of between 315?. G. and 450 C, passing the same through a kiln out of contactwith air at a temperature approximating 600 C. to 900C cooling the resultant out of contact with. air, washing the same with hot Water and then drying and rekilning out of contact with air rior to use, substantially in the manner an for the purpose'set forth.

3. The process of activating and hardening decolorizin char herein set forth, consisting, essentia ly in adding thereto a bituminous distillate non-volatile at ordinary temperatures, subjecting the same to red heat out of contact with, air, and then .cool

ing, substantially as set forth.

4. As an article of manufacture a decoloriziug char treated with a bituminous distilslate non-volatile at ordinary temperatures,

subjecting the same to red heat out of contact with air, and then cooling, substantially as set forth. I

5. As an article of manufacture, a decolorizing char treated with a distillate obtained from bituminous matter at a temperature between 315 C. and 450 C.

6. The process of activating and harden ing synthetic bone char herein set forth, con

distillate of coal obtained at a temperature of between 315EC.'.' and;450. C. non-vole carbon herein set forth, consisting in a ding thereto a bituminous.

tile at ordinary temperatures, subjecting the same to red heat out of contact with air, and

then' cooling, substantially as set forth;

yonannns -B. DAVIS. 

